CN101323770A - Preparation of lumber adhesive - Google Patents
Preparation of lumber adhesive Download PDFInfo
- Publication number
- CN101323770A CN101323770A CNA2007100243304A CN200710024330A CN101323770A CN 101323770 A CN101323770 A CN 101323770A CN A2007100243304 A CNA2007100243304 A CN A2007100243304A CN 200710024330 A CN200710024330 A CN 200710024330A CN 101323770 A CN101323770 A CN 101323770A
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- Prior art keywords
- urea
- adhesive
- tackiness agent
- preparation
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention relates to a preparation method of a timber adhesive. The timber adhesive is mainly used in the timber processing industry and is especially applicable to the processing of various artificial boards. The preparation method of the timber adhesive is characterized in that: the adhesive takes phenol-urea-formaldehyde copolymer resin as a main component and under the synthetic action of an additive, a stable hydrosoluble resin adhesive is obtained; the synthesis process of the adhesive comprises that the urea reacts with the formaldehyde solution under the condition of alkalescence, which is then added with acid for being adjusted to be acidic so as to carry out resinification, during which phenolic resin with high degree of polymerization is added, as well as the urea is added for the second time to carry out copolycondensation so as to obtain a stable polymer solution.
Description
Technical field
The present invention is a kind of wood adhesive and preparation method thereof, is mainly used in wood processing industry, is specially adapted to the processing of various artificial boards.
Background technology
China is the country of a forest reserves scarcity, and the timber imbalance between supply and demand is very outstanding, and one of approach that solves this contradiction is to improve the utilization ratio of timber, carries out research, the development and utilization of glued board, shaving board, fiberboard energetically.In various wood-based plate processings, the consumption of tackiness agent is the 10-30% of plank gross weight according to the timber variety difference, so wood working sticks with glue the maximum kind that agent becomes tackiness agent, and the research of wood adhesive also becomes the important content of adhesives industries.
Wood processing industry tackiness agent commonly used is urea-formaldehyde resin and phenol-formaldehyde resin glue at present, but they all exist many shortcomings: poor water resistance, and intensity is low, and aging easily, burst size of methanal is big, and cost is high.
In recent years, field of polymer technology produces various copolymerization and polycondensation products, improves a lot on performance, also constantly improves on the tackiness agent performance that wood processing field is used.Along with the development of wood-processing industry, plank trends towards thinner, so-called micro veneer bonding, be that the plank of thickness less than 0.5mm sticked on the base material, cover with paint, lacquer, colour wash, etc. evenly convenient, not seep through, good weatherability, require greatly to improve, need new product to adapt to new requirement.
Summary of the invention
The purpose of the invention provides a kind of urea-resion adhesive of modification, it has solved the weak point of existing tackiness agent, and it is strong to have water tolerance, and ageing resistance is good, be difficult for advantages such as seep through and curing speed piece, free formaldehyde content be low, and manufacturing cost is lower.Because the curing speed piece, be difficult for seep through and have been widely used, not only can be used for glued board, shaving board, fiberboard, and be specially adapted to the bonding of thin plate, be that a kind of wood of excellent property sticks with glue agent.
The object of the present invention is achieved like this: tackiness agent is a main component with the phenol-urea-formaldehyde copolymer resins, under the comprehensive action of additive, obtains stable water soluble resin tackiness agent; The synthesis technique of this tackiness agent is after urea and formaldehyde solution are reacted under weak basic condition, to be adjusted to acidity with acid, carries out the resinifying reaction, in the time of the resinifying reaction, the resol that adds high-polymerization degree, and add for the second time that urea carries out copolycondensation, obtain stable polymer solution.
Urea of the present invention and formaldehyde solution, its mol ratio is 1.3-2.5, under acidic conditions, carry out in the addition reaction, the resol that adds alkalescence carries out copolycondensation, solution P H value remains on 7-8, add the second batch of urea that accounts for urea total amount 10-30% simultaneously, other adds additives polyvinyl alcohol, obtains the tackiness agent of good dispersity, stable storing.Not only can be used for glued board, shaving board, fiberboard, and be specially adapted to the bonding of thin plate, be that existing aminoresin institute is irrealizable.
Tackiness agent of the present invention must be modulated in use, and modulator approach is similar to the method for general amino tackiness agent, promptly makees solidifying agent with acid or acid-salt, suitably adds filler and gets final product.
Embodiment
Below in conjunction with embodiment the present invention is further described.
Embodiment 1
In the reactor of reflux exchanger is housed, feed intake: 94 parts of weights of phenol, 208 parts of weights of 37% formaldehyde solution in following ratio, 0.1 part of weight of calcium hydroxide, the pH value of regulating mixed solution with aqueous sodium hydroxide solution is to 8-9, and temperature rising reflux 1 hour obtains copolycondensation solution.
Be equipped with in the reactor of reflux exchanger at another, feed intake in following ratio: 128 parts of weights of 37% formaldehyde solution, 2 parts of weights of polyvinyl alcohol are waited to dissolve the back and are added 47 parts of weights of first urea, the pH value of regulating mixed solution with aqueous sodium hydroxide solution is to 8-9, temperature rising reflux 1 hour; Slowly add the copolymerization solution that obtains above, add 13 parts of weights of second batch of urea again, react to viscosity arrival requirement, blowing.
Gained adhesive technology index:
Solids content 49.5-50.5%
Viscosity (20 ℃) 140-180 CP
Free formaldehyde content＜0.5%
PH value 7-8
The glued board made from above-mentioned tackiness agent, even also seep through not of hard sheet, mechanical property is:
Dried shape shearing resistance＞1.5MPa;
63 ℃ of water logging bubbles are after 3 hours, and intensity does not descend;
After boiling water boils 3 hours, strength retention ratio＞30%.
Embodiment 2
Production technique is substantially the same manner as Example 1, but additives such as increase derivatived cellulose, the tackiness agent performance that obtains is more excellent.
Gained adhesive technology index:
Solids content 49.5-50.5%
Viscosity (20 ℃) 150-200 CP
Free formaldehyde content＜0.5%
PH value 7-8
With the glued board that above-mentioned tackiness agent is made, the Cortex Fraxini mandshuricae thin plate of bonding 0.3mm, mechanical property is:
Dried shape shearing resistance＞1.5MPa;
63 ℃ of water logging bubbles are after 3 hours, and intensity does not descend;
After boiling water boils 3 hours, strength retention ratio＞40%.
Base material comes unglued when destroying, and thin plate and base material cemented surface are intact substantially.If on shaving board, fit plank, wood destruction when peeling off, cemented surface is intact.
Claims (3)
1, a kind of preparation method of wood adhesive is characterized in that this tackiness agent is a main component with the phenol-urea-formaldehyde copolymer resins, under the comprehensive action of additive, obtains stable water soluble resin tackiness agent.
2, the preparation technology of tackiness agent is after urea and formaldehyde solution are reacted under weak basic condition in the right 1, be adjusted to acidity with acid, carry out the resinifying reaction, in the time of the resinifying reaction, the resol that adds high-polymerization degree, and add for the second time that urea carries out copolycondensation, obtain stable polymer solution.
3, urea and the formaldehyde solution in the right 2, its mol ratio is 1.3-2.5, under acidic conditions, carry out in the addition reaction, the resol that adds alkalescence carries out copolycondensation, the solution pH value remains on 7-8, add the second batch of urea that accounts for urea total amount 10-30% simultaneously, other adds additives polyvinyl alcohol, obtains the tackiness agent of good dispersity, stable storing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100243304A CN101323770A (en) | 2007-06-14 | 2007-06-14 | Preparation of lumber adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100243304A CN101323770A (en) | 2007-06-14 | 2007-06-14 | Preparation of lumber adhesive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101323770A true CN101323770A (en) | 2008-12-17 |
Family
ID=40187477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100243304A Pending CN101323770A (en) | 2007-06-14 | 2007-06-14 | Preparation of lumber adhesive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101323770A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085679A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Wood modifying solution as well as preparation method and application thereof |
| CN107722209A (en) * | 2017-10-31 | 2018-02-23 | 西南林业大学 | A kind of environmentally friendly condensation copolymerization resin wood adhesive of formaldehydeless release and preparation method and application |
| CN107722208A (en) * | 2017-10-31 | 2018-02-23 | 西南林业大学 | A kind of environment-friendly type condensation copolymerization resin wood adhesive and preparation method and application |
-
2007
- 2007-06-14 CN CNA2007100243304A patent/CN101323770A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085679A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Wood modifying solution as well as preparation method and application thereof |
| CN107722209A (en) * | 2017-10-31 | 2018-02-23 | 西南林业大学 | A kind of environmentally friendly condensation copolymerization resin wood adhesive of formaldehydeless release and preparation method and application |
| CN107722208A (en) * | 2017-10-31 | 2018-02-23 | 西南林业大学 | A kind of environment-friendly type condensation copolymerization resin wood adhesive and preparation method and application |
| CN107722208B (en) * | 2017-10-31 | 2019-10-08 | 西南林业大学 | A kind of environment-friendly type condensation copolymerization resin wood adhesive and the preparation method and application thereof |
| CN107722209B (en) * | 2017-10-31 | 2019-10-08 | 西南林业大学 | A kind of environmentally friendly condensation copolymerization resin wood adhesive of formaldehydeless release and the preparation method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20081217 |